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4. CMT2250A-EM
The CMT2250A-EM is the Rx on/off control module with a CMT2250A device, 4 LEDs, battery case and a couple of necessary
external components. The EM-Connector on the back side of the module allows the connection to the USB Programmer. The
main components are listed below:
Figure 22. Top View of CMT2250A-EM
1.
EM-Connector
–The EM-Connector is 10-pin, 2.54 mm male connector used to connect to the USB Programmer.
2.
Power Mode Switch
–The power mode Switch (S1) is used to select the power supply source of the module. The
module can be supplied by the battery (S1 switched to the VBAT side) or the EM-Connector (S1 switched to the VEXT
side). It is recommended to put the switch to the VEXT side when programming the CMT2250A-EM with the USB
Programmer.
3.
LED
– 4 orange LEDs are available on the PCB connecting the pins DATA0 – DATA3. The LEDs are lighted up
according to different button modes selected at the Tx side to demonstrate the functions of the CMT2150A and
CMT2250A.
The definition of the EM-connector on the CMT2250A-EM is given below:
Pin
Signal Name
1
CSB
2
GND
3
NC
4
VDD
5
SCL
6
NC
7
SDA
8
NC
9
NC
10
NC
Figure 23. EM-Connector on the
CMT2250A-EM
Table 12. CMT2250A-EM EM-Connector Pin Definition
